In another setback for Mamata Banerjee-led TMC, former Rajya Sabha MPs Sushmita Dev, Sukhendu Sekhar Ray and Prakash Chik Baraik joined the BJP on Thursday. The three leaders resigned from the Rajya Sabha and quit the TMC last month after the party's Assembly election defeat. Their move comes after several TMC MLAs broke away under expelled MLA Ritabrata Banerjee's leadership.